SOUTH AMERICAN NEMATOGNATHI. 343 



hb. Bfick aud sides plaiu; D. 10; A. 9; caudal with dusky spots, the tip 

 of its lower lobe being black; origin of dorsal much nearer tip of cau- 

 dal than tip of snout; head longer than broad, about 6 in the total 

 length; eye 3f in head; caiulal with numerous accessory raj's. (Stein- 

 dachner.) mao'ops 281. 



aa. Caudal rounded; dorsal much behind the middle of the total length. 

 D. 9-10; color uniform. 



/. Caudal without accessory rays; dorsal entirely in front of the anal; 

 head about 6 in the total length. D. 9; A. 7. (Eeiuhardt.) 



iiisidio.'iHs 282. 

 ff. Caudal with numerous accessory rays; dorsal partly over the anal; 

 head about 7 in the total length. D. 9-10; A. 8. (Steindachner.) 



reinhardtii 283. 



278. Stegophilus maculatus. 



Stegophilus maculatus Steindachner, Denk. Ak. Wien, xli, 2.j, plate 

 iv, fig. 2, 1879 (La Plata); Eigenm. & Eigenm. Proc. Cal. Acad. 

 2d Ser. ii, 54, 1889. 



Habitat: Eio Plata. 



This species is known only from the types. 



279. Stegophilus punctatus. 



Stcijophilus puucfnfus Boulenger, Proc. Zool. Soc. Lond. March, 

 1887, 279, pi. xxi, fig. 4 (Canelos); Eigenm. & Eigenm. 1. c. 

 Habitat: Eastern Ecuador. 



280. Stegophilus intermedius. 



Sief/ophilus intvnnndlus Eigenm. & Eigenm. 1. c. (Goyaz). 



Type, No. 9,842; one specimen .08 m. Goyaz. Seuhor Honorio. 



. This species, found in a region intermediate between 

 the localities where piinct<dus and Tnaculatiis are found 

 combines in a remarkable way the characters of those 

 species. 



Elongate, compressed behind, depressed forward; head 

 somewhat longer than wide, snout pointed; eye large, 1 

 in the snout, 3h in the head. Mouth large; upper lip 

 with two series of teeth; intermaxillaries and mandibles 

 with four series of depressible teeth, those of the inner 

 series enlarged at the tip. Lower lip not dilated, barbel 

 shorter than the eye. 



Opercle with tw^o spines; preopercle with 5 or 6 claw- 

 like spines. 



Origin of dorsal about equidistant from tip of caudal 



